\documentclass{article}
% translate with >> pdflatex -shell-escape <file>

% This file is used as unit test for pgfplots, copyright by Christian Feuersaenger.
% 
% See
%   http://pgfplots.sourceforge.net/pgfplots.pdf
% for pgfplots.
%
% Any required input files (for <plot table> or <plot file> or the table package) can be downloaded
% at
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/
% and
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/plotdata/

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\pagestyle{empty}

\begin{document}


\begin{tikzpicture}
\begin{axis}[
		visualization depends on= 5*cos(deg(x))\as \perpointmarksize,
		scatter/@pre marker code/.append style={/tikz/mark size=\perpointmarksize},
]
	\addplot+[
		scatter,
		scatter src=y,
		samples=41,
		]
		{sin(deg(x))};
\end{axis}
\end{tikzpicture}
\end{document}
